51620849290 has 16 divisors (see below), whose sum is σ = 93248201160. Its totient is φ = 20574856960.

The previous prime is 51620849261. The next prime is 51620849303. The reversal of 51620849290 is 9294802615.

It can be written as a sum of positive squares in 4 ways, for example, as 44057590201 + 7563259089 = 209899^2 + 86967^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51620849290.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9182395 + ... + 9188014.

Almost surely, 2^51620849290 is an apocalyptic number.

51620849290 is a deficient number, since it is larger than the sum of its proper divisors (41627351870).

51620849290 is a wasteful number, since it uses less digits than its factorization.

51620849290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18370697.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 51620849290 in words is "fifty-one billion, six hundred twenty million, eight hundred forty-nine thousand, two hundred ninety".